Radio receiving apparatus



May 11, 1937. D. DOMIZI RADIO RECEIVING APPARATUS 2 Sheets-Sheet 1 Filed March 7, 1956 INVENTOR. Dante Dcmugl ATTORNEY 11/111,11 Ill/04415712 y 1, 1937. D. DOMIZI 2,080,253

RADIO RECEIVING APPARATUS Filed March 7, 1936 2 SheetsSheet '2 FEE--3 INVENTOR.

' Dante Dumii QMW A TTORNEY.

Patented May 11, 1937 UNITED STATES PATENT OFFICE RADIO RECEIVING APPARATUS poration of Ohio Application March 7, 1936, Serial No. 67,626

3 Claims.

This invention pertains in general to radio receiving apparatus and specifically relates to a control arrangement for such apparatus.

The principal object of this invention consists in providing a construction of tuning arrangement having an indicating dial for designating various selected programs.

A further object of the invention comprises providing a selective indicating device incorporat- 1 ing a movable light source for indicating various selected positions of the indicating device.

A further object of the invention resides in a construction of tuning and indicating device employing a light transmitting dial and centrally provided switch control element, together with a tuning actuating arrangement disposed peripherally with respect to the dial for actuating the movable tuning elements of a radio'receiver and indicating, by means of a light beam, the position of such elements with respect to said dial.

These and other objects will be apparent from the following, reference being had to the accompanying drawings in which like reference numerals designate corresponding parts throughout and in which:

Fig. 1 is a front elevation of one embodiment of the invention showing a portion of a radio receiver;

Fig. 2 is a rear view of the apparatus represented in Fig. 1;

Fig. 3 is an enlarged vertical sectional view of the apparatus depicted in Fig. 1; and

Fig. 4 is a schematic representation of the electrical organization employed in connection with the invention.

This invention contemplates the provision of a tuning system for radio receivers of either the space radio or wired radio type, in which movable elements are provided for changing the 40 resonance characteristics of the radio circuits to render the set responsive to frequencies representative of different programs. In accordance with the invention, a stationary indicating dial is provided in a prominent position on the radio 45 set, this dial being translucent for permitting a movable light beam to indicate thereon the relative position of the tuning elements With respect to indicia on the dial. The invention also provides a switching arrangement centrally disposed of the p 50 dial for permitting control of the radio receiving set.

Referring to the drawings in detail, the front panel I of the radio receiving set is provided with a ground glass plate 2 which forms the indicating 55 dial. The plate 2 is held in position in a back recess of the panel I by a suitable clamping means as shown in Fig. 3. This dial plate 2 is provided on its front face with opaque indicia 3 arranged in groups of radial lines. Each group of radial lines corresponds to a particular program channel or station and the lines in each group represent various tuning conditions within the range of a selected program channel or station.

The dial plate 2 is axially aligned with the shaft of a tuning capacitor 4 which is mounted upon part of the chassis 5 of the radio receiving set which includes the front panel I. The variable tuning capacitor 4 is representative of various movable tuning elements which may be employed in a radio receiver. The operating shaft 6 of the variable tuning capacitor 4 is provided with an arm I which has a bifurcated end 8 in which a spindle I0 is positioned. Stop members 9 are provided on the rear of the panel I at spaced angular positions upon opposite sides of the indicia 3 to limit the annular movement of the pin Ii] and arm I. The spindle I0 is mounted upon a circular operating member I I which gives the efiect of an encircling frame for the dial 2 when viewed from the front of the panel I, as shown in Figs. 1 and 3. The annular member I I is provided with a peripheral recess I2 which accommodates roller bearings 13 journaled to the member II, and a retainer ring Ila, the latter being secured to member I I by screws Ilb. These roller bearings engage an annular track I4 secured to the panel I- and provide for the facile rotation of the member II about the axis of the dial plate 2. A fin I5 is provided on the member II and serves as a handle for manually imparting rotary motion to the member II in a tuning operation.

The spindle II] is also provided with a clamp I1 from which depends a projector light source I8. This light source I8 includes a housing and lamp, the housing being provided with a longitudinal slit to direct a narrow beam of light against the dial plate 2 radially with respect to the center thereof. By this arrangement, rotary motion of the member I I, in operating the tuning capacitor 4 to select various programs, produces an illuminated indication on the dial 2, when viewed from the front of the panel I, as determined by the relative angular position of the beam of light from the slit IS.

A spherical knob 22 is mounted upon a spindle 23 which extends through a hole in the center of the plate 2. This spindle 23 is connected through a coupling unit 24 with a switch 25.

This switch 25 is mounted upon a transverse bracket 26 extending across the rear portion of the recesses in the panel I, as shown in Figs. 2 and 3. On the lower front of the dial 2 a name 29 or other indicia may be provided. This name is of opaque material similar to the indicia 3 and is illuminated by a light projector 30 mounted behind the dial plate 2 .on parts of the radio set cabinet structure as shown in Figs. 2 and 3. This projector 30 is provided with a light slit which projects a substantially rectangular patch of light upon the dial plate 2 to cover the name or indicia 29.

Referring to the schematic representation of Fig. 4, it will be seen that the light sources of projectors l8 and 3B are provided with electrical connections which extend into the power supply system of the radio set. The switch 25 is provided with connections to the radio set and controls the main power supply circuit to the radio set whereby the entire operation thereof is controlled.

.In the operation of the foregoing apparatus, to control a radio receiving set, the operator may first move the knob 22 to operate switch 25, thereby initiating the energized operation of the radio receiving set. As soon as the radio receiving set is energized, the projectors i3 and 30 are energized, thereby illuminating the indicia 29 and providing the indicating light beam defined by slit IS. The fin l may then be grasped by the hand of the operator to cause the rotation of the member H to operate the capacitor 4, thereby rendering the radio receiving set responsive to a desired frequency band. The selection of a desired frequency band will be indicated by the light beam from slit l9 appearing adjacent a selected group of indicia 3. Minute adjustments of the tuning condition of the set may then be made within the selected frequency band range, these adjustments being indicated by the relative position of the light beam from slit l9 with respect to the various lines forming the selected indicia group It will be noted that the fin I5 is positioned radially with respect to the slit I 9 so that the fin 15 also serves for indication purposes.

Although a preferred form of apparatus has been disclosed, it Will be apparent that various modifications and equivalent structures may be produced without departing from the intended scope of the invention. I do not, therefore, desire to limit myself to the foregoing except as may be pointed out in the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. Radio apparatus controlling means comprising, a radio set having movable tuning means, a substantially circular opening in one of the walls of said set, a translucent plane surface indicating panel having indicia thereon mounted in said opening, a tuning control element in the form of an annular member mounted for rotation in said opening, roller bearings between the edges of said opening and said member to facilitate rotation thereof about the axis of said panel, a radially disposed fin mounted on said annular member for imparting motion to said member, a mechanical coupling between said member and said tuning means and said fin being so located angularly with respect to said tuning means as to indicate as said member is rotated the various tuning positions of said tuning means with respect to said indicia on said panel.

2. Radio apparatus control means comprisprising, a radio set having movable tuning means, a translucent plane surface indicating panel having indicia thereon mounted in a circular opening in said radio set, said indicia being n he f rm of a lural ty f s pa r p of radial lines, a rotary tuning control member ring shaped to form a completely encircling frame for said panel, mounting means for said member including an annular groove and an annular tongue therefor and roller bearings between said tongue and groove for permitting the rotation of said member about the axis of said panel, a radially disposed fin on said member for imparting rotary motion to said member, mechanical coupling means between said member and said tuning means and a source of light carried by said coupling means for illuminating restricted portions only of said panel to indicate with respect to said indicia the various tuning positions of said tuning means.

3. Radio apparatus control means comprisprising, a radio set having movable tuning means, a transulcent plane surface indicating panel having indicia thereon mounted in a circular opening in said radio set, said indicia being in the form of a plurality of separate groups of radial lines, a rotary tuning control member ring shaped to form a completely encircling frame for said panel, mounting means for said member including an annular groove and an annular tongue therefor and roller bearings between said tongue and groove for permitting the rotation of said member about the axis of said panel, a radially disposed fin on said member for imparting rotary motion to said member, mechanical coupling means between said member and said tuning means and a source of light carried by said coupling means for illuminating restricted portions only of said panel, said fin and said restricted light area being so angularly related to said tuning means that both may indicate with respect to said indicia the various tuning positions of said tuning means.

DANTE DOMIZI. 

